Diabitics

Updated

One of my close relative aged 67 have undergone open heart sugery. And he is suffering from diabitcies,. he is very catious about his health. he is monitoring it regualrly and is very strict on his diet and medication. But he diabity is verying very much. He has consulted many doctors, but his efforts are all in vain. He finds pain in thies and doctors say it is because of heart surgary.
My question is, if he have infection in his stomach, or pus cells inurine, can be the cause of unstable of this discease. I was told one of the medico that this can be the reason. How far this can work.
I shall be thankful for early reply, as he is also living with his old age wife like me.
MMY